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WEBCAST: Sun Block

Sky watchers keen to see the upcoming total solar eclipse won't be left out of the dark even if they can't get to a vantage point in South America, Africa, or western Asia. On 29 March, the Exploratorium in San Francisco will webcast the event live from Side, Turkey. On hand at the city's Roman amphitheater will be four telescopes to track the moon's progress and two scientists to explain happenings such as the appearance of the corona. This wispy outer layer of the solar atmosphere stands out during totality, when the moon's disk obscures the sun. The festivities start at 5 a.m. U.S. Eastern Time. Totality will begin around 5:54 a.m. and will last a mere 3 minutes and 41 seconds.